Helicopter



Aug. 20, 1929- c. w. JACKSON HELICOPTER Filed March 14, 1928 2 Smets-Sheet ATTORNEY Aug. 20, 1929.

c. w. JACKSON 1,725,276

HELICOPTER Filed March 14, 1928 2 sheen-sheet' 2 INVENTOR ATTORNEY VIi Patented AAug. 20, 1929.

UNITED STATES l CHARLES WILLIAM JACKSON",

OF DRACUT, MASSACHUSETTS.

HELICOPTER.

Application filed Karch 14, 1928. Serial No. 261,592. A

The object of this invention is to provide a machine of the type indicated in which a propeller or propellers are vemployed for directing an air 'current downwardly in a centrally` located tube, duct, or air tunnel,

and in which other propellers direct currents downwardly and toward the central air current, for t pressure above the machine to a maximum extent, andfacilitate the lifting action due to the air pressure below.

parting ventional'ly, and upper and lower propellersl A further object is to -provide-a special arrangement of air ducts, with their propellers, and' to So arrange certain of the latter that -the tendency of the entire machine to 'rotate will be' eliminated or avoided.

A further object is to provide for the lforward drive, and or'utilizing the propellers serving this purpose for guiding the machine.

With the foregoing and other objects in view, the invention consists in the novel construction and arrangement of elements described, illustrated, and claimed, it being understood that modifications may be made within the scope of the claims without defrom the spirit of the invention.

In t e drawingsforming part of this application- Figure 1 shows the machine in vertical section;

Figure 2 is a side elevation;

Figure 3 is a top plan view.

In the construction of the device, I employ a central tube, duct or tunnel 10 including an upper flared portion 11, and having communicationwith a main lower air chamberor airspace 13, of which the upper wall is designated 14:. l

An annular fuel chamber or fuel tank is formed between thevall of duct 10 or the wall 12) and the concentric wall 15, anupper element 16 closing this chamber, and'itbeing assumed that the fuel is to be conducted to fuel mixing devices in the usualv manner.

Duct 10 houses an engine -17 Ashown con- 18 and 19 are assumed to have their blades deiiected at different angles, lessening or avoiding 'the tendency of the machine to rotateor spin, due to the action of the motor or engine. A similar plan may be carried out in mounting the other lifting propellers. The outer tubes or ducts 20 are surrounded by fuel receptacles 21, and the discharge of e purpose of reducing the airair from these ducts -is toward the center, and

toward the current created by the central propellers. kThe motors for the outer ducts are designated 24, and their propellers are shown at 25, the discharge openings being designated 26. The driving propellers 27, 28, may also be controlled in the manner reuired to permit of guiding the machine in t is manner, or by these means, by varying the relative speeds of the en ines 30, 31.

The several air tubes, which may be assembled as, shown in Figure 3, enter a main housing of which the side portions are shown in elevation in Figure 2, the housing as a whole being designatedvl 32 and including a lower annular element y33, to"which the stay wires or rods 34 are connected.l These elements are also secured near their upper ends as' shown, and the air tubes are tied and braced by connecting element or elements 35.

A deck or machine, an maybe protected by railin 37, the deck being braced by elements suc lat-form 36 extends around the as 38, and being adapted for the construe-'80 '.tion of cabins thereon,` if desired.

The purpose is to reduce the air pressure above the machine, and to direct the air` currents approximately asdescribed, in the lower central portion of the device, and the direction of drive of the' propellers mounted' on vertical-v axes is subject to variation, as

are other details, within .the scope of the claims. V

The air chamber Ybelow the central air tube ,is to beof sufficient capacity to permit A of receiving the air currents from the outer lifting :propellers without causing anyv of the currents to retarder counteract the yflowV of other currents, andwith this in -viewthe discharge from ropellers 25 may be deected downwardl by any suitable means or by so di t e ducts 20x, For stabilizing pu e propellers 25 may be driven at. iierent speeds, varying the airl pressure above one-side of the machine with reference toV that above the other side thereof.

What I claim isl 1.v In a helicopter, a supporting structure,

a. central vertical a1r tube mounted' therein and having openends, a propeller positioned to discharge air through said tube, a 'motor for driving the propeller, additional ducts mounted' vertically and propellers therefor, motors for driving thesepropellers, said ad- 5 driving propellers mountedy thereon androtat-able about horizontal axes, a central vertical air tube mounted within said structure, a propeller positioned to discharge air through said tube, a motor for driving the- 10 propeller, additional air tubes and propel- 1ers therefor, motors for driving these propellers, said additional tubes being deflected to discharge air toward the current created within the central tube.

3. In a helicopter, a supportingstructure, a central air duct mounte thereon, a propel ler positioned to discha air through said duct, a second propeller, aving blades positioned at an angle with thoseof the propel-I ler first named, and being movable about the same axis of rotation, a motor for dri these Propellers, .additional air ducts an propellers therefor, motors for driving the propellers last named with the additional ducts for directing air currents in converging relation.

In testimony whereof I ailix my signature.

CHARLES WILLIAM JACKSON.

and means associated 

